The Feynman iε in string theory

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Abstract: The Feynman iε is an important ingredient in defining perturbative scattering amplitudes in field theory. Here we describe its analog in string theory. Roughly one takes the string worldsheet to have Lorentz signature when a string is going on-shell although it has Euclidean signature generically. (This article is based on a talk presented at the Zuminofest in Berkeley, California, May 2-4, 2013.)

Original languageEnglish (US)
Article number55
JournalJournal of High Energy Physics
Issue number4
StatePublished - Apr 1 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


  • Bosonic Strings
  • Superstrings and Heterotic Strings


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